Crossword Genius

Lass's note found by small bottle, unfinished (6)

Ross

I believe the answer is:

sophia

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'lass's' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

'note found by small bottle unfinished' is the wordplay.
'note' becomes 'so' (musical note).
'found by' means one lot of letters go next to another.
'small bottle' becomes 'phial' (a phial or vial is a small bottle).
'unfinished' means to remove the last letter.
'phial' with its final letter taken off is 'phia'.
'so'+'phia'='SOPHIA'

Can you help me to learn more?

(Other definitions for sophia that I've seen before include "-- Loren, Italian actress" , "Girl's name" , "Italian film star" .)

I've seen this clue in The Times.
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